package com.health.pay.tencent.common;

import java.security.MessageDigest;

public class MD5 {
   
	private static String byteArrayToHexString(byte b[]) {
	      StringBuffer resultSb = new StringBuffer();
	      for (int i = 0; i < b.length; i++)
	         resultSb.append(byteToHexString(b[i]));

	      return resultSb.toString();
	   }

	   private static String byteToHexString(byte b) {
	      int n = b;
	      if (n < 0)
	         n += 256;
	      int d1 = n / 16;
	      int d2 = n % 16;
	      return hexDigits[d1] + hexDigits[d2];
	   }

	   public static String MD5Encode(String origin, String charsetname) {
	      String resultString = null;
	      try {
	         resultString = new String(origin);
	         MessageDigest md = MessageDigest.getInstance("MD5");
	         if (charsetname == null || "".equals(charsetname))
	            resultString = byteArrayToHexString(md.digest(resultString
	                  .getBytes()));
	         else
	            resultString = byteArrayToHexString(md.digest(resultString
	                  .getBytes(charsetname)));
	      } catch (Exception exception) {
	      }
	      return resultString;
	   }

	   private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
	         "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };


}
